期刊
SCIENCE
卷 332, 期 6033, 页码 1076-1079出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1202122
关键词
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资金
- NSF [OCE 06-23256, OCE 09-28607, EAR03-07112, EAR05-06720]
- Joint Oceanographic Institutions, Inc.
- NERC [NE/G014817/1] Funding Source: UKRI
- Natural Environment Research Council [NE/G014817/1] Funding Source: researchfish
- Division Of Ocean Sciences
- Directorate For Geosciences [0928607] Funding Source: National Science Foundation
Global cooling and the development of continental-scale Antarctic glaciation occurred in the late middle Eocene to early Oligocene (similar to 38 to 28 million years ago), accompanied by deep-ocean reorganization attributed to gradual Antarctic Circumpolar Current (ACC) development. Our benthic foraminiferal stable isotope comparisons show that a large delta(13)C offset developed between mid-depth (similar to 600 meters) and deep (>1000 meters) western North Atlantic waters in the early Oligocene, indicating the development of intermediate-depth delta(13)C and O(2) minima closely linked in the modern ocean to northward incursion of Antarctic Intermediate Water. At the same time, the ocean's coldest waters became restricted to south of the ACC, probably forming a bottom-ocean layer, as in the modern ocean. We show that the modern four-layer ocean structure (surface, intermediate, deep, and bottom waters) developed during the early Oligocene as a consequence of the ACC.
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